The MIPS portion of the configuration menu is outdated
and does not define the complete set of toolchain options
for current cores.

At the above link, the following link and as an attachment
is the table of information from which the additional
configuration menu entries will be defined.

Table 1 shows the relationship between feature names and
the instruction set.

Table 2 shows the relationship between core code names
and features.

The actual configuration menu patch will follow any day, RSN.

http://morethan.org/bldrt/mips_arch.ods

Mikez